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Papers by Mohamed Benabderrahim

Research paper thumbnail of Evaluation of yield potential and some agronomic traits variability in Mediterranean alfalfa cultivars in the field under Tunisian conditions

Research paper thumbnail of Comparison of the effectiveness of ISSR and SSR markers in determination of date palm (Phoenix dactylifera L.) agronomic traits

Australian Journal of Crop Science

Research paper thumbnail of Yield and Leaf Minerals Composition of Alfalfa Populations (Medicago sativa L.) from Arid-regions (Mediterranean Climate)

Natural product communications

Research paper thumbnail of Diversity of Lucerne (Medicago Sativa L.) populations in South Tunisia

Pakistan Journal of Botany

Twenty cultivated populations of lucerne (Medicago sativa L) collected from different oasis of Tu... more Twenty cultivated populations of lucerne (Medicago sativa L) collected from different oasis of Tunisian south were evaluated for morphology and yield. Important among-accessions variation was observed for all traits by variance analysis (length and width of central leaflet at flowering, length and diameter of stem, growth habit, date of flowering, weight of 1000 seed and total fresh and dry matter) when population effect was highly significant (p<0.05) excepted four i.e., stems number, number of smell by inflorescence, number of inflorescences by cluster and plant colour. The large least significant difference at 5% values indicate that a large proportion of this variability can be attributed to genetic variability between individual plants within an accession. Principal component analysis (on three axes represented 59.85% of the total variation) and cluster analysis, based in significant traits, show the distribution of the populations is not according to their geographic origins. Correlation between yield and morphological trait shows that dry matter is negatively correlated to stem length (-0.61) and positively to stem diameter (0.43). Fresh matter was negatively correlated to seed weight (-0.31) and positively to leaf dimension. This work will be completed by a selection programme in these twenty accessions for the improvement of the alfalfa cultivated in the Tunisian south.

Research paper thumbnail of A Comparison of Performance Among Exotic and Local Alfalfa (Medicago Sativa L.) Ecotypes Under Tunisian Conditions

Romanian agricultural research

ABSTRACT

Research paper thumbnail of Germination and emergence variability of alfalfa (Medicago sativa L.) landraces collected in Southern Tunisia oases

Spanish Journal of Agricultural Research, 2011

Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world. It has been ... more Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world. It has been originated from the Caucasus region . The species presents purple flowers, a tap root, an erect growth habit, coiled pods and no winter dormancy. This plant improves the yield and quality of the following crops by atmospheric nitrogen fixation . Furthermore, it reduces diseases Abstract Variability in germination under controlled conditions with and without salt, seeds characteristics and field emergence were evaluated for 20 landraces of Medicago sativa ssp sativa, a forage legume collected from three sites in Tunisia. Highly significant differences were recorded among the landraces (p < 0.001) for all the characters studied except tegument colour. Number of seeds produced per plant ranged between 378 and 460 seeds g -1 . Emergence responses of seeds were different among landraces and sites and their values ranged between 12 to 45%. Salt stress (150 mM) caused substantial reduction in final and rate of germination of all the landraces with an average decline of 62.4 and 69.7%, respectively. Final germination values ranged from 26.5 to 75.75% when supplied distilled water. However, final germination values ranged from 10.75 to 32.5% when the seeds were exposed to saline water (150 mM). Rate of germination ranged from 12.75 to 63.25% and from 6.25 to 21.25% at non-saline and salt stress, respectively. Cluster analysis separated the 20 landraces into four clusters. Three landraces in the first cluster had the lowest germination and the greatest field emergence. One landrace composed the second cluster and showed both high germination and field emergence. Two landraces in the third cluster presented greater germination and low emergence. The other landraces constituted the fourth cluster and had intermediates emergence and germination.

Research paper thumbnail of Investigation of genetic variation in Tunisian date palm (Phoenix dactylifera L.) cultivars using ISSR marker systems and their relation with fruit characteristics

Phoenix dactylifera L. was introduced in Tunisia a very long time ago and plays an important soci... more Phoenix dactylifera L. was introduced in Tunisia a very long time ago and plays an important socioeconomic role, especially in the south of the country. Genetic diversity and relationships among 26 cultivars were assessed with 7 ISSR primers. A total of 43 amplifi ed bands were obtained. Principal component analyses based on Nei genetic distances showed no geographical separation with the exception of the Dhahbi cultivar, which has a limited geographical distribution. A group of cultivars that are also phonetically clustered was distinguished. Th ese cultivars have a common maturity period and a common fruit consistency. Th e Mantel test emphasizes a signifi cant correlation between genetic distance and fruit consistency (r = −0.120; P = 0.026). A signifi cant diff erentiation was observed between the soft and dry subpopulations (PhiPT = 0.126; P = 0.007). Discriminant analyses highlight the association of markers with fruit consistency groups. Fruit consistency is an economically important feature. In the future, these fi ndings may be utilized for improving management strategies in Tunisia and other countries where date palms are economically signifi cant.

Research paper thumbnail of Essai d'adaptation de 16 cultivars de luzerne pérenne (Medicago sativa L.) dans un système oasien du sud tunisien : Gabès (local) et 15 cultivars étrangers

SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oas... more SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oasis system of south Tunisia: Gabès (local) and 15 foreign cultivars". With the aim of chosing the best alfalfa cultivars selected abroad and evaluating their performance in Tunisia, an adaptation essay of sixteen perennial alfalfa cultivars (a local one named "Gabès" and the others were introduced

Research paper thumbnail of Date Palm Status and Perspective in Tunisia

Date Palm Genetic Resources and Utilization, 2015

Date palm is one of the most important fruit trees grown in southern Tunisia and represents a goo... more Date palm is one of the most important fruit trees grown in southern Tunisia and represents a good cash crop for many farmers. Here, we provide an overview of the Tunisian date palm status. In fact, this important subtropical fruit crop is currently in danger due to several constraints such as anthropogenic spread of disease, water shortages, salinization, and irregular climatic conditions. In addition, Tunisian date palm is threatened by genetic erosion as a consequence of the predominance of the elite cultivar Deglet Noor in modern plantations and the disappearance of many cultivars with medium and low fruit qualities. A series of successful experiments were widely applied for micropropagation of endangered cultivars. Many exhaustive resource inventory programs of date palms have been done in Tunisia. Tunisian genetic diversity was studied by using morphological and molecular markers; some are related to agronomic traits. Tunisian date production increased during recent decades and represents more than 18 % of the national tree production. Tons of cull dates are rejected by processing industries, and attempts to develop new products are supported by research programs. However, the major products are currently destined for exportation because of limited local marketing and the dietary habits of the Tunisian people.

Research paper thumbnail of Evaluation of yield potential and some agronomic traits variability in Mediterranean alfalfa cultivars in the field under Tunisian conditions

Research paper thumbnail of Comparison of the effectiveness of ISSR and SSR markers in determination of date palm (Phoenix dactylifera L.) agronomic traits

Australian Journal of Crop Science

Research paper thumbnail of Yield and Leaf Minerals Composition of Alfalfa Populations (Medicago sativa L.) from Arid-regions (Mediterranean Climate)

Natural product communications

Research paper thumbnail of Diversity of Lucerne (Medicago Sativa L.) populations in South Tunisia

Pakistan Journal of Botany

Twenty cultivated populations of lucerne (Medicago sativa L) collected from different oasis of Tu... more Twenty cultivated populations of lucerne (Medicago sativa L) collected from different oasis of Tunisian south were evaluated for morphology and yield. Important among-accessions variation was observed for all traits by variance analysis (length and width of central leaflet at flowering, length and diameter of stem, growth habit, date of flowering, weight of 1000 seed and total fresh and dry matter) when population effect was highly significant (p<0.05) excepted four i.e., stems number, number of smell by inflorescence, number of inflorescences by cluster and plant colour. The large least significant difference at 5% values indicate that a large proportion of this variability can be attributed to genetic variability between individual plants within an accession. Principal component analysis (on three axes represented 59.85% of the total variation) and cluster analysis, based in significant traits, show the distribution of the populations is not according to their geographic origins. Correlation between yield and morphological trait shows that dry matter is negatively correlated to stem length (-0.61) and positively to stem diameter (0.43). Fresh matter was negatively correlated to seed weight (-0.31) and positively to leaf dimension. This work will be completed by a selection programme in these twenty accessions for the improvement of the alfalfa cultivated in the Tunisian south.

Research paper thumbnail of A Comparison of Performance Among Exotic and Local Alfalfa (Medicago Sativa L.) Ecotypes Under Tunisian Conditions

Romanian agricultural research

ABSTRACT

Research paper thumbnail of Germination and emergence variability of alfalfa (Medicago sativa L.) landraces collected in Southern Tunisia oases

Spanish Journal of Agricultural Research, 2011

Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world. It has been ... more Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world. It has been originated from the Caucasus region . The species presents purple flowers, a tap root, an erect growth habit, coiled pods and no winter dormancy. This plant improves the yield and quality of the following crops by atmospheric nitrogen fixation . Furthermore, it reduces diseases Abstract Variability in germination under controlled conditions with and without salt, seeds characteristics and field emergence were evaluated for 20 landraces of Medicago sativa ssp sativa, a forage legume collected from three sites in Tunisia. Highly significant differences were recorded among the landraces (p < 0.001) for all the characters studied except tegument colour. Number of seeds produced per plant ranged between 378 and 460 seeds g -1 . Emergence responses of seeds were different among landraces and sites and their values ranged between 12 to 45%. Salt stress (150 mM) caused substantial reduction in final and rate of germination of all the landraces with an average decline of 62.4 and 69.7%, respectively. Final germination values ranged from 26.5 to 75.75% when supplied distilled water. However, final germination values ranged from 10.75 to 32.5% when the seeds were exposed to saline water (150 mM). Rate of germination ranged from 12.75 to 63.25% and from 6.25 to 21.25% at non-saline and salt stress, respectively. Cluster analysis separated the 20 landraces into four clusters. Three landraces in the first cluster had the lowest germination and the greatest field emergence. One landrace composed the second cluster and showed both high germination and field emergence. Two landraces in the third cluster presented greater germination and low emergence. The other landraces constituted the fourth cluster and had intermediates emergence and germination.

Research paper thumbnail of Investigation of genetic variation in Tunisian date palm (Phoenix dactylifera L.) cultivars using ISSR marker systems and their relation with fruit characteristics

Phoenix dactylifera L. was introduced in Tunisia a very long time ago and plays an important soci... more Phoenix dactylifera L. was introduced in Tunisia a very long time ago and plays an important socioeconomic role, especially in the south of the country. Genetic diversity and relationships among 26 cultivars were assessed with 7 ISSR primers. A total of 43 amplifi ed bands were obtained. Principal component analyses based on Nei genetic distances showed no geographical separation with the exception of the Dhahbi cultivar, which has a limited geographical distribution. A group of cultivars that are also phonetically clustered was distinguished. Th ese cultivars have a common maturity period and a common fruit consistency. Th e Mantel test emphasizes a signifi cant correlation between genetic distance and fruit consistency (r = −0.120; P = 0.026). A signifi cant diff erentiation was observed between the soft and dry subpopulations (PhiPT = 0.126; P = 0.007). Discriminant analyses highlight the association of markers with fruit consistency groups. Fruit consistency is an economically important feature. In the future, these fi ndings may be utilized for improving management strategies in Tunisia and other countries where date palms are economically signifi cant.

Research paper thumbnail of Essai d'adaptation de 16 cultivars de luzerne pérenne (Medicago sativa L.) dans un système oasien du sud tunisien : Gabès (local) et 15 cultivars étrangers

SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oas... more SUMMARY - "Adaptation essay of 16 perennial alfalfa cultivars (Medicago sativa L.) in an oasis system of south Tunisia: Gabès (local) and 15 foreign cultivars". With the aim of chosing the best alfalfa cultivars selected abroad and evaluating their performance in Tunisia, an adaptation essay of sixteen perennial alfalfa cultivars (a local one named "Gabès" and the others were introduced

Research paper thumbnail of Date Palm Status and Perspective in Tunisia

Date Palm Genetic Resources and Utilization, 2015

Date palm is one of the most important fruit trees grown in southern Tunisia and represents a goo... more Date palm is one of the most important fruit trees grown in southern Tunisia and represents a good cash crop for many farmers. Here, we provide an overview of the Tunisian date palm status. In fact, this important subtropical fruit crop is currently in danger due to several constraints such as anthropogenic spread of disease, water shortages, salinization, and irregular climatic conditions. In addition, Tunisian date palm is threatened by genetic erosion as a consequence of the predominance of the elite cultivar Deglet Noor in modern plantations and the disappearance of many cultivars with medium and low fruit qualities. A series of successful experiments were widely applied for micropropagation of endangered cultivars. Many exhaustive resource inventory programs of date palms have been done in Tunisia. Tunisian genetic diversity was studied by using morphological and molecular markers; some are related to agronomic traits. Tunisian date production increased during recent decades and represents more than 18 % of the national tree production. Tons of cull dates are rejected by processing industries, and attempts to develop new products are supported by research programs. However, the major products are currently destined for exportation because of limited local marketing and the dietary habits of the Tunisian people.